Diack makes his debut for Ireland

BUENOS AIRES - Uncapped back-row forward Robbie Diack will make his Ireland rugby debut against Argentina in Saturday's first Test in Resistancia on Saturday.

South Africa-born Diack, 28, fills in for the injured Peter O'Mahony with fellow back-rower Jordi Murphy also poised to make his first Test start.

Simon Zebo, Jack McGrath, Iain Henderson, Felix Jones, Darren Cave and Luke Marshall were also drafted into the starting XV as coach Joe Schmidt made eight changes to the side that clinched the Six Nations title against France.

Ulster's Cave will take the number 13 shirt that belonged for so long to now-retired talisman Brian O'Driscoll.

Leinster pair Devin Toner and Jamie Heaslip drop to the bench after helping their province to the Celtic League title last weekend, while Cian Healy, Gordon d'Arcy, Sean O'Brien and Tommy Bowe have been all rested for the two-Test series.

Two other new faces in the squad are Connacht duo Kieran Marmion and Kiwi-born Rodney Ah You, who could make their debuts off the bench.